<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert
                title="添加商品信息案"
                type="info"
                center
                show-icon 
                :closable="false">
            </el-alert>
            <!-- 步骤条区域 active用来指定激活项的索引-->
            <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price"  type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProps"
                                @change="handleChange"></el-cascader>
                            </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label='item.attr_name' v-for="item in manyTableData" :key="item.attr_id" >
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action表示图片要上传到的后台API地址  list-type指定图片的显示方式-->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headersObj"
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 付文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%"
        >
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
    import _ from 'lodash'
    export default {
        data(){
            return{
                // 当前激活的Index
                activeIndex:'0',
                // 添加商品的表单数据对象
                addForm:{
                    goods_name:'',
                    goods_price:0,
                    goods_weight:0,
                    goods_number:0,
                    // 商品所属的分类数组
                    goods_cat:[],
                    // 图片的数组
                    pics:[],
                    // 商品的详情描述
                    goods_introduce:'',
                    attrs:[]
                },
                addFormRules:{
                    goods_name:[
                        {
                            required:true,
                            message:'请输入商品名称',
                            trigger:'blur'
                        }
                    ],
                    goods_price:[
                        {
                            required:true,
                            message:'请输入商品价格',
                            trigger:'blur'
                        }
                    ],
                    goods_weight:[
                        {
                            required:true,
                            message:'请输入商品重量',
                            trigger:'blur'
                        }
                    ],
                    goods_number:[
                        {
                            required:true,
                            message:'请输入商品数量',
                            trigger:'blur'
                        }
                    ],
                    goods_cat:[
                        {
                            required:true,
                            message:'请选择商品分类',
                            trigger:'blur'
                        }
                    ],

                },
                // 商品分类列表
                catelist:[],
                cateProps:{ 
                    expandTrigger: 'hover',
                    label:'cat_name',
                    value:'cat_id',
                    cheildren:'children'
                    },
                // 动态参数列表数据
                manyTableData:[],
                // 静态属性列表数据
                onlyTableData:[],
                // 上传图片的URL地址
                uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
                // 图片上传组件的headers请求头对象
                headersObj:{
                    Authorization:window.sessionStorage.getItem('token')
                },
                previewPath:'',
                previewVisible:false,
            }
        },
        created(){
            this.getCateList()
        },
        methods:{
            // 获取所有商品分类数据
            async getCateList(){
                const {data:res}=await this.$http.get('categories')
                if (res.meta.status!==200) {
                    return this.$message.error('获取商品分类数据失败')
                }
                this.catelist=res.data
                // console.log(this.catelist)
            },
            // 级联选择器选中项变化会触发这个函数
            handleChange(){
                if (this.addForm.goods_cat.length!==3) {
                    this.addForm.goods_cat=[]
                }
            },
            beforeTabLeave(activeName,oldActiveName){
                if (oldActiveName==='0' && this.addForm.goods_cat.length!==3) {
                    // 阻止标签页切换
                    this.$message.error('请先选择商品分类')
                    return false
                }
            },
            async tabClicked(){
                // console.log(this.activeIndex)
                // 证明访问的是动态参数面板
                if (this.activeIndex==='1') {
                    const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                    if (res.meta.status!==200) {
                        return this.$message.error('获取动态参数列表失败')
                    }
                    res.data.forEach(item=>{
                        item.attr_vals=item.attr_vals.length===0?[]:item.attr_vals.split(' ')
                    })
                    this.manyTableData=res.data
                    // console.log(this.manyTableData)
                }
                else if(this.activeIndex==='2'){
                    const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                    if (res.meta.status!==200) {
                        return this.$message.error('获取静态属性失败')
                    }
                    this.onlyTableData=res.data
                }
            },
            // 处理图片预览效果
            handlePreview(file){
                this.previewPath=file.response.data.url
                this.previewVisible=true
            },
            // 处理移除图片的操作
            handleRemove(file){
                // 获取将要删除的图片的临时路径
                const filePath=file.response.data.tmp_path
                // 从pics数组中，找到这个图片对应的索引值
                const i=this.addForm.pics.findIndex(x=>x.pic===filePath)
                // 调用数组的splice方法，把图片信息对象，从pics数组中移除
                this.addForm.pics.splice(i,1)
            },
            // 监听图片上传成功的事件
            handleSuccess(response){
                // console.log(response)
                // 1.拼接得到一个图片信息对象
                const picInfo={pic:response.data.tmp_path}
                // 2.将一个图片信息对象push到pics数组中
                this.addForm.pics.push(picInfo)
                // console.log(this.addForm.pics)
            },
            add(){
                this.$refs.addFormRef.validate(async valid=>{
                    if (!valid) {
                        return this.$message.error('请填写必要的表单项')
                    }
                    // 执行添加的业务逻辑
                    // 安装lodash依赖 调用cloneDeep(obj)方法
                    // 把addForm进行深拷贝
                    const form=_.cloneDeep(this.addForm)
                    form.goods_cat=form.goods_cat.join(',')
                    // 处理动态参数
                    this.manyTableData.forEach(item=>{
                        const newInfo={
                            attr_id:item.attr_id,
                            attr_value:item.attr_vals.join(' ')
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    // 处理静态属性
                    this.onlyTableData.forEach(item=>{
                        const newInfo={
                            attr_id:item.attr_id,
                            attr_value:item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    // 
                    form.attrs=this.addForm.attrs
                    console.log(form)
                    // 发起请求 添加商品
                    // 商品的名称 必须是唯一的
                const {data:res}=await this.$http.post('goods',form)
                    if (res.meta.status!==201) {
                        return this.$message.error('添加商品失败') 
                    }
                    this.$message.success('添加商品成功')
                    this.$router.push('/goods')
                })
            }
        },
        computed:{
            cateId(){
                if (this.addForm.goods_cat.length===3) {
                    return this.addForm.goods_cat[2]
                }
                return null
            }
        }
    }
</script>

<style lang="less" scoped>
    .el-checkbox{
        margin: 0 10px 0 0 !important;
    }
    .previewImg{
        width: 100%;
    }
    .btnAdd{
        margin-top: 15px;
    }
</style>